Is one better than the other?

1) Handguard attaches to the barrel nut with screws.

2) Handguard attaches by clamping at the bottom.

I have found that when they clamp at the bottom, they are usually easier to line up. I had one that I bought locally that had several screw hole positions, it would never line up. I too k it back.

quote:

Originally posted by Excam_Man:
Is one better than the other?

1) Handguard attaches to the barrel nut with screws.

2) Handguard attaches by clamping at the bottom.

#1 requires you to vary the torque on the barrel nut to achieve proper alignment. This may require shims to achieve proper torque and alignment. This is a pain in the butt.

#2 allows you to properly torque your barrel nut and then align your handguard independently.

IMHO option 2 is far superior.

Don't forget that there are other variations of handguards with the benefits of #2, but without requiring a clamp at the bottom. Like Bravo Company's KMR rails, which use a pair of cross-bolts towards the top of the handguard that fit into a groove running around the middle of the barrel nut. I like that design.

quote:

Originally posted by RogueJSK:
Don't forget that there are other variations of handguards with the benefits of #2, but without requiring a clamp at the bottom. Like Bravo Company's KMR rails, which use a pair of cross-bolts towards the top of the handguard that fit into a groove running around the middle of the barrel nut. I like that design.

To me it looks like the other side of the same coin. Whether they clamp at the bottom or at the top, I don't see much difference.


I do not like designs where the bolts that provide the clamping force are threaded directly into the aluminum handguard itself.

The BCM RogueJSK alluded to uses a steel bolts that thread into a steel clamp on the opposite side.

I am partial to the Armalite handguards that I have used, in which the bolts thread into steel nuts that are recessed in the opposite side.


I think both are a good design.

quote:

Originally posted by RogueJSK:
Don't forget that there are other variations of handguards with the benefits of #2, but without requiring a clamp at the bottom. Like Bravo Company's KMR rails, which use a pair of cross-bolts towards the top of the handguard that fit into a groove running around the middle of the barrel nut. I like that design.

Back in the summer, I used one of these AERO enhanced uppers where the handguard mounting area is forged with the upper as one piece...no lining up the gas tube. Came with the proprietary barrel nut and wrench for around $100 from Monmouth...super easy. The AERO handguard fit perfectly (almost like it was made for it )...eight screws...AERO also makes a barrel nut w/shims to index the gas tube, for use with standard uppers with the same 8 screw pattern.

The only downside would be if you wanted to use a full float handguard other than the ones by AERO...they would have to fit the upper, I think they are out there, but I don't know the brands...

quote:

Originally posted by RogueJSK:
Don't forget that there are other variations of handguards with the benefits of #2, but without requiring a clamp at the bottom. Like Bravo Company's KMR rails, which use a pair of cross-bolts towards the top of the handguard that fit into a groove running around the middle of the barrel nut. I like that design.

I didn't 'forget', because I didn't know they existed. lol

Thanks again for another lesson. You have a wealth of knowledge.

One of these days, I'm going to have everything to build my first upper. And with ALL you guys helping, I know it will get done correctly.

quote:

Originally posted by Excam_Man:
Is one better than the other?

1) Handguard attaches to the barrel nut with screws.

2) Handguard attaches by clamping at the bottom.

3) Monolithic upper

That looks nice... not sure I'd go that way for modularity

I like the Aero Enhanced upper and their hand guards. The only negative is you can't lap the upper based on the design.

Regarding attaching rails, I prefer the type that attaches via screws into a mounting nut. I've one that uses screws underneath that clamp the rail onto the nut. It always loosen up.

quote:

Originally posted by Excam_Man:
That looks nice... not sure I'd go that way for modularity

It's a niche product for sure.

It simplifies mounting optics without being hampered by how much eye relief you can gain with a cantilever scope mount.

Would also have some utility if you were using a rail mounted aiming laser.

I have one sitting and waiting on a barrel for a PRS build, and waiting on an optic as well.

What the heck does the barrel nut wrench look like for that monolithic upper...a 20" spark plug socket

Edit...I just youtubed it and that's a pretty good description...that was interesting

quote:

Originally posted by Bisleyblackhawk:
What the heck does the barrel nut wrench look like for that monolithic upper...a 20" spark plug socket

Edit...I just youtubed it and that's a pretty good description...that was interesting

Spot on!!! Hahaha. It's a work of art really. I'm looking forward to finishing it and shooting it.

It's like changing spark plugs on a 426 Hemi